Answer:
Answer: SPEED
Explanation:
I believe this is so because distance, reference point, and direction are the characteristics of the word position. For example, let's say you're standing in a certain spot, which would be the reference point. You're facing a certain direction, and you are a certain distance from something (let's say a building is beside you). Speed will NOT determine your position as you are standing, in this case. So speed will be your answer.
Let me know if all goes well :))